Lennox Genuine OEM MERV 10 Replacement Media Filter X0587 (20x26x5) Fits Models BMAC20-20CE, CAC-12, White Rodgers ACB2000, FR2000, Emerson SST2000, EAC12-20-1. Also Fits Sears Model 839200.  Convert your EAC to a Media System. (Please note: If converting from an electronic air cleaner, the new filter is thicker, you may have to remove the upper and lower guide bars so that the new filter will fit. Remove the screws holding the bar.)